电化学氢化物发生与原子吸收光谱联用对鲜牛奶中无机砷的形态分析  

SPECIATION OF INNORGANIC ARSENIC IN MILK BY ELECTROCHEMICAL HYDRIDE GENERATION COUPLED TO ATOMIC ABSORPTION SPECTROMETRY

作　　者：李勋[1] 戚琦[1] 薛珺[1] 朱业晋[1] 

机构地区：[1]赣南师范学院化学与生命科学学院,江西赣州341000

出　　处：《食品研究与开发》2007年第11期121-123,共3页Food Research and Development

基　　金：江西省教育厅科学技术研究项目(赣教技字[2007]298)

摘　　要：在0.06mol/L硫酸电解质中,不同价态的无机砷具有较高的电化学氢化物发生效率,同时又存在较为明显的差异。通过使用不同的电流条件,采用电化学氢化物发生与原子吸收光谱联用技术有效地实现了无机砷的形态分析。在电流为0.6A和1A条件下,As(Ⅲ)和As(V)在0～40μg/L浓度范围内均呈良好的线性关系。As(Ⅲ)和As(V)检出限分别为0.3μg/L和0.6μg/L。该方法成功应用于食用鲜牛奶中无机砷的形态分析,样品加标回收率为96%～104%。Adequate sensitivity and difference in ratio of slopes of the calibration curves for As （Ⅲ） and As（V） can be achieved at 0.06 mol/L H2SO4. The speciation of inorganic arsenic can be performed by controlling the electrolytic currents with electrochemical hydride generation coupled to atomic absorption spectrometry. The calibration curves were Linear up to 40 μg/L for both As （Ⅲ） and As （V） at 0.6 A and 1 A. The detection Limits of the method were 0.3 μg/L and 0.6 μg/L for As （Ⅲ） and As （V） at 0.6 A, respectively. The method was successfully applied to speciation of inorganic arsenic in milk, and the recovery was in the range of 96 %-104 %.

关 键 词：原子吸收光谱 电化学氢化物发生 无机砷 牛奶 

分 类 号：TS252[轻工技术与工程—农产品加工及贮藏工程]